For best-case performance you want to watch both your memory bus and FSB bandwidth. You want these bandwidths to closely match each other. Better if your FSB is slightly faster than your memory bus. It's never a good idea to run your memory bus higher than your FSB.
I advise using this program to calculate:
CPU-Z
From CPU-Z write down the following values:
CPU TAB --> Bus Speed = _______
Memory TAB --> Frequency = ________ (Memory Frequency)
simple bandwidth calculations:
------------------------------------------------------------------------------------
FSB bandwidth: (Bus Speed) x (64-bit data bus) / (8 bits/byte)
= (Bus Speed x 8) MB/s
now compare compared with
Memory bandwidth: (Memory Frequency) x (2 for DDR) x (64-bit data bus) / (8 bits/byte)
------------------------------------------------------------------------------------
If you compare these values you will have your 'FSB : DRAM' ratio, which is also shown under the Memory TAB using CPU-Z.
If your FSB is a little faster, it is better because your FSB doesnt just handle the memory, but also handles information from your PCI-BUS.
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